<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    <link rel="stylesheet" href="./index.css">
</head>

<body>
    <div class="wrap">
        <div class="title">学生系统</div>
        <div id="form">
            <p>姓名<input id="username" type="text" value="张三123" /></p>
            <p>年龄<input id="age" type="text" value="21" /></p>
            <p>性别
                <select id="gender">
                    <option>男</option>
                    <option>女</option>
                    <option>你猜</option>
                </select>
            </p>
            <p>
                <input type="button" value="添加" id="addBtn" />
                <input type="button" value="排序" id="sortBtn" />
            </p>
        </div>
        <table id="table">
            <thead>
                <tr>
                    <th>姓名</th>
                    <th>年龄</th>
                    <th>性别</th>
                    <th>操作</th>
                </tr>
            </thead>
            <tbody>
            </tbody>
        </table>
    </div>

    <script>
        // 1.获取元素 
        var usernameEle = document.querySelector("#username");
        var ageEle = document.querySelector("#age");
        var genderEle = document.querySelector("#gender");
        var addBtn = document.querySelector("#addBtn");
        var tbodyEle = document.querySelector("tbody");
        // 立刻获取了input里的值 ，放在username变量里存起来了 ，后面就不会改变了；
        // var username = usernameEle.value;
      
        // console.log(username);
        // 点击添加的时候获取 学生的信息；
        addBtn.onclick = function(){
            var username = usernameEle.value;
            var age = ageEle.value;
            var gender = genderEle.value;
            // console.log(username,age,gender);
            // 模板字符串 可以支持换行；
            // var str = "<div>"+
            //                 "<span>1</span>"+
            //                 "<span>2</span>"+
            //           "</div>";
            tbodyEle.innerHTML += `<tr>
                                        <td>${username}</td>
                                        <td>${age}</td>
                                        <td>${gender}</td>
                                        <td><button>删除</button></td>
                                  </tr>`;
            
        //    获取删除按钮，一定是在删除按钮生成之后；
            addDeleEvent();
        }

        function addDeleEvent(){
            var btns = document.querySelectorAll("td button");
            btns.forEach(function(btn){
                btn.onclick = function(){
                    // console.log("点击了删除按钮")
                    this.parentNode.parentNode.remove();
                }
            })
        }
    </script>
</body>

</html>